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•STUDY GROUPS- FIRST MEETING THIS WEEK
•EXAM #1 THIS WEEK! FRIDAY, SEPTEMBER 18TH
•Addition to Study Guide:
Given the masses of two reactants and a chemical equation, be able to determine e which is the limiting reactant
(Chemical Analysis is not on the exam)
Announcements
Limiting Reactants
2H2 + O2 2H2O
Example: We have 10 mol H2 and 7 mol O2
What is the number of moles of O2 needed to react with all of the H2?
How much O2 will be left over?7 mol O2 available- 5 mol O2 needed= 2 mol O2
22
222 52
110 Omol
Hmol
OmolHmolOmol
Limiting Reactants
If given the amount of starting materials, how do I determine which is the limiting reactant?
Two approaches:1. Determine the theoretical yield from each2. Divide the # moles of each by its stoichiometric #(In both approaches, the smaller # is the limiting
reactant)
Example
The reaction:
We have 5.0 mol SO2, 4.o mol O2, and 10.0 mol H2O. Which is the limiting reactant?
What if I started with 5g SO2, 4g O2, and 10g H2O?
)(2)()()(2 42222 aqSOHlOHgOgSO